When assembling cooling system follow these instructions:
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Use black (red) colored hose for hot cycle and transparent hose for cold cycle.
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Always ensure that hoses have enough space and do not fold.
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Hoses have to stay clear from sharp cants.
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To connect hoses use enclosed band.
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Mount cooler as not to be affected by vibrations.
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Place the cooler to be as perpendicular as possible to fly direction. Gradient of slope 30°does not
affect cooling system work. Gradient of 40° slightly reduce work of cooler, but gradient more than
that cause that cooling system is not working properly.
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Please note that cooler will work only if air goes thru. That’s why there always has to be enough
space behind the cooler for outlet.
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Filling gap should be placed at the highest place when the scale is on the ground. Than it is possible to
check water level.
Filling and venting cooling system:
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Put you aircraft on its undercarriage, unscrew the filling lid and pour water in it.
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Get off both hoses from the pump and when water starts to come out put them back on the pump.
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Fill the water up and put back the lid.
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Raise the air model up so the engine is at the highest position and shake slightly.
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Place the aircraft back on ground and put off and quickly back hoses going to pump. Redundant air
will get away.
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Fulfill water level, start the engine and leave it running for about 1minute. While the engine is idling
still refill water. Shut down the engine and close filling lid.
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Start running in the engine. In first 30 minutes stop the engine after every 5 minutes and check water
level and fill it if needed.
Operation recommendation:
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Always check coolers temperature while first starts. Temperature should be between 45 – 80°C (113 –
176F). The best operation temperature is 60°C (140F). By size of cooling space you can manage
keeping recommended temperature.
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If cooler is not behind the propeller reduce running engine on ground to minimum. In this kind of
scales run the engine in on some stand with cooler place behind the propeller.
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Before each fly check if the pump strap is tight and if there is enough water in the system.
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Check tightness of all hoses if leaking.
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After every 5 running hours exchange the pump strap.
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If the power is loosing while flying or irregular run occurs, always land on immediately and double-
check cooling system.
Carburetor adjustment
Basic setting: (The values are derived from the position of clock-hands)
- adjusting needle (L) for low revolutions range 1turn and 45 min
- adjusting needle (H) for high revolutions range 1 turn and 10 min
The new engine comes adjusted to the basic setting. This setting should be kept during running the engine
in!
Caution! Never tighten the adjusting needles with too much strength. This may cause damage of the
needles. If the needles are damaged this way it is no longer possible to adjust the carburetor and it is
necessary to exchange it for a new one.
After the engine has been run in, adjust it following the instructions below:
- start the engine and warm it up
- let the engine run at idle speed for approx. 5 seconds
Choke lever
Adjusting needle (L)
Adjusting needle (H)
Crankcase pressure inlet
Air pressure inlet
Fuel inlet
Throttle lever
